I so dearly wish more comic artists would put more thought into story telling then into character design, which is really much more like costume design in practice. MrWolfeConcoctions, who I have been watching for a while, is taking the first tentative steps in that direction in a journal post I hope anyone interested in story telling would take the time to read and ponder. I even break my own self imposed silence to add my 2 cents worth on the subject.
I also agree that most webcomics and comics lack any story structure. Most times I find that the opening 10+ pages are wasted on the heroes back story. I'm lost by that point. One of the biggest problems I see these comics is timing. To much time wasted on a topic, fight scene or plot point. Really guys/gals, move the story along!
When I first started, my comics were movie scripts I wanted to sell. I found a script writing book and basic structure to work from. I understood that I have so many pages before an Act of the story is done. If I can't get to it, rework it.